Analysis of expression of CD2, CD3, and T cell antigen receptor molecules during early human fetal thymic development.

Journal Article (Journal Article)

To define early stages of T cell maturation during human fetal thymic development, we have used mAb reactive with CD2, CD3, and TCR molecules in indirect immunofluorescence assays on a series of early human fetal thymic specimens. Using a technique of quantitating the relative proportions of fluorescent-positive cells present in tissue sections, we found at 8.5 wk of gestational age after arrival of CD7+ T cell precursors into the thymic rudiment, 60% of thymic CD7+ cells were CD2+, 4% were CD3+ and none was TCR-delta+ or TCR beta+. Moreover, cells reactive with anti-CD2 antibodies against T11(2) and T11(3) epitopes of CD2 as well as thymic stromal cells expressing the CD2 ligand, lymphocyte function associated Ag-3, were also present at 8.5 wk. From 9.5 wk to birth TCR beta+ cells increased to include greater than 90% of all CD7+ cells while TCR-delta+ cells fell from a peak of 11% of CD7+ cells at 9.5 wk to 1% of CD7+ cells at birth. These data suggest that epitopes of CD2 molecules are expressed early on during fetal thymic development. Moreover, these data suggest that CD7+, CD2+, cytoplasmic CD3+ T cell precursors in man give rise to both TCR-delta+ T cells as well as to T cells expressing TCR-alpha beta.

Full Text

Duke Authors

Cited Authors

  • Haynes, BF; Singer, KH; Denning, SM; Martin, ME

Published Date

  • December 1, 1988

Published In

Volume / Issue

  • 141 / 11

Start / End Page

  • 3776 - 3784

PubMed ID

  • 2903194

International Standard Serial Number (ISSN)

  • 0022-1767


  • eng

Conference Location

  • United States